EP1618352A2 - Procede et dispositif pour determiner des parametres de mouvement d'une surface conductrice, de preference profilee - Google Patents

Procede et dispositif pour determiner des parametres de mouvement d'une surface conductrice, de preference profilee

Info

Publication number
EP1618352A2
EP1618352A2 EP04711559A EP04711559A EP1618352A2 EP 1618352 A2 EP1618352 A2 EP 1618352A2 EP 04711559 A EP04711559 A EP 04711559A EP 04711559 A EP04711559 A EP 04711559A EP 1618352 A2 EP1618352 A2 EP 1618352A2
Authority
EP
European Patent Office
Prior art keywords
coil
sensor
measuring
coupling impedance
imaginary part
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04711559A
Other languages
German (de)
English (en)
Inventor
Stanislav Mednikov
Mark Netchaewskij
Felix Mednikov
Werner GRÖMMER
Martin Sellen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Micro Epsilon Messtechnik GmbH and Co KG
Original Assignee
Micro Epsilon Messtechnik GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE10332761A external-priority patent/DE10332761A1/de
Application filed by Micro Epsilon Messtechnik GmbH and Co KG filed Critical Micro Epsilon Messtechnik GmbH and Co KG
Publication of EP1618352A2 publication Critical patent/EP1618352A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/14—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/003—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring position, not involving coordinate determination
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
    • G01D5/2006—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils
    • G01D5/202—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils by movable a non-ferromagnetic conductive element
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
    • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
    • G01P3/488—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by variable reluctance detectors

Definitions

  • the invention relates to a method and a device for determining movement parameters of a conductive, preferably profiled surface relative to a sensor, the sensor comprising at least one coil for generating an electromagnetic alternating field, which due to the reaction as a result of changes in position between the surface and the sensor is subject to a change that is detected by means of the coil.
  • a distance sensor for a magnetic levitation vehicle is known from DE 32 44 420 C2.
  • This sensor has one transmitting and two receiving coils, the transmitting coil being designed as an elongated flat winding which is aligned with its coil axis obliquely to the direction of travel of the magnetic levitation vehicle.
  • This special arrangement partially reduces the so-called groove-tooth ripple. With this sensor, however, only distances in the range of 10 to 15 mm can be measured.
  • DE 199 27 759 A1 discloses a device for magnetic distance measurement between a toothed, ferromagnetic magnet wheel and a magnetically sensitive sensor positioned in the immediate vicinity of the magnet wheel, with which the movement of the toothed wheel is detected.
  • the crux of the invention is the use of a permanent magnet, the pole face of which facing the toothed object is sufficiently large in relation to the pole wheel module, so that the position of the neutral zone in the permanent magnet is almost unaffected by the respective position of the pole wheel teeth.
  • This device could also be used to determine the speed, speed and path of the magnet wheel.
  • a disadvantage of this device is the low accuracy, especially in the case of relatively large distances between the sensor and the magnet wheel.
  • the magnetic gap-dependent damping of the alternating magnetic field is used by eddy current effects in the reaction rail.
  • the inductive reactance of the coil system is completely compensated for with the aid of a capacitor operated in parallel or in series, and the distance signal is essentially determined from the effective resistance of the coil system.
  • the disadvantage here is that the tolerances of the parameters of the coil system and of the compensating capacitor that are unavoidable in real construction have a very strong influence on the measuring accuracy of the entire device.
  • the present invention is based on the object of specifying a method and a device for determining movement parameters of a conductive, preferably profiled surface relative to a sensor of the type mentioned at the beginning, according to which on the one hand the greatest possible distance between the profiled surface and the sensor can be measured and on the other hand the groove-tooth ripple, ie the signal changes that occur when driving over the teeth and grooves, as well as the influences caused by temperature fluctuations are largely eliminated.
  • measurement and evaluation of the relative speed between surface and sensor should be made possible at the same time.
  • a method for determining movement parameters of a conductive, preferably profiled surface relative to a sensor by means of a method having the features of patent claim 1.
  • a method of the type mentioned at the outset is designed such that the change in position is derived from the coupling impedance (Z c ) of the coil and the real part (R c ) and the imaginary part (X c ) of the complex coupling impedance (Z c ) of the coil are determined , wherein the distance d between the sensor and the surface is calculated on the basis of the values determined using an algorithm.
  • a device for determining movement parameters of a conductive, preferably profiled surface relative to a sensor is achieved by a device with the features of the claim 11 solved.
  • a device of the type mentioned at the outset is designed in such a way that the coupling impedance Z c of the coil can be measured, a special measuring arrangement for determining the real part R 0 and imaginary part X c of the complex coupling impedance Z c of the coil system and for calculating the distance and the relative Speed (or the speed) between the surface and the sensor is provided on the basis of the measurements mentioned.
  • the senor could also comprise a coil system with at least two coils, wherein the second coil could advantageously be used to compensate for drifts or other influences.
  • the distance d between the profiled surface and the sensor could be determined using function (1):
  • L denotes the sum of the length of a tooth and a groove (see FIG. 3a) and T (F X ) the period of the function F x .
  • the same coil could be used to generate the alternating electromagnetic field and as a receiver coil. This reduces the effort of the measuring process and makes the measuring device simple and easy to handle according to the invention, while at the same time possible sources of error are excluded.
  • d denotes the distance between the sensor and the surface, ⁇ the feed frequency and ⁇ and ⁇ the electrical conductivity or the magnetic permeability of the material of the surface.
  • phase angle ⁇ 0 of the complex coupling impedance Z c could be derived from these equations by the equation
  • phase angle ⁇ c is independent of the distance d.
  • the distance d between the conductive, preferably profiled surface and the sensor generating an alternating field is based on the equations (4) and (5) via the equation
  • the distance d calculated using equation (7) between the sensor and the profiled surface has essentially no groove-tooth ripple.
  • the senor could have a measuring coil, which is used both for generating an alternating field and as a receiving coil.
  • the measuring coil could be describable by the mathematical model according to equations (4) and (5), the measuring coil being able to be designed in such a way that the mathematical model can be used in the calculation of the coil parameters.
  • an embodiment has proven to be advantageous in which the magnetic field of the measuring coil rises monotonically in the direction of movement regardless of the distance to the center of the measuring coil and then drops monotonously again in the same way.
  • Such a course of the magnetic field could be realized, for example, in that the winding parts of the measuring coil running perpendicular to the direction of movement are designed in such a way that the inductive components of these parts are reduced very much and thus have hardly any influence on the measurement result.
  • the coil system could have a compensation coil (reference coil), the impedance of which is independent of the distance d. It is important that the quality of the reference coil at maximum distance d between the sensor and the surface is equal to the quality of the measuring coil if the surface has no influence on the measuring coil. These requirements could be met via the coil parameters, such as number of turns, wire diameter, etc. Weighted difference formation between the real and imaginary parts of the two coils then makes it possible to compensate for the influence of temperature.
  • the measuring coil and the compensation coil could be fed with alternating currents of the same fixed frequency.
  • the signal processing of real (R c ) and imaginary (X c ) the complex coupling impedance (Z c ) of the measuring coil could be carried out in two variants.
  • the real and imaginary part of the complex coupling impedance Z 0 could be determined, for example, in the following three steps:
  • Real part R c and imaginary part X 0 are determined from the complex coupling impedance Z c .
  • FIG. 1 is a schematic representation of a block diagram of a device according to the invention for determining motion parameters tern of a conductive, preferably profiled surface relative to a sensor,
  • FIG. 2a shows a schematic illustration of an inductive sensor according to a first exemplary embodiment of a device according to the invention for measuring the distance to a gear and for measuring the speed of the gear
  • FIG. 2b is a schematic representation of the sensor of FIG. 2a with greater accuracy
  • FIG. 3a shows a schematic illustration of an inductive sensor according to a second exemplary embodiment of a device according to the invention for measuring the distance of a magnetic levitation vehicle from its profiled roadway and for measuring its speed
  • 3b shows the sensor from FIG.
  • FIGS. 2 and FIGS. 3 in a schematic representation of a sensor according to FIGS. 2 and
  • FIG. 5 shows a schematic representation of a sensor according to a further exemplary embodiment of a device according to the invention
  • Fig. 7 in a diagram the function F x depending on the position x at different distances d. 1 shows a block diagram of a device according to the invention for determining movement parameters of a conductive, preferably profiled surface relative to a sensor.
  • an oscillator 1 generates a sinusoidal voltage U ⁇ of a certain fixed frequency f and at the same time a second sinusoidal voltage U 2 _ of the same frequency f, which is 90 ° out of phase with the voltage U.
  • the voltage U is connected to the input of a driver 2, which feeds the sensor 3, consisting of a measuring coil and a reference coil, with current.
  • the difference is formed in an amplifier 4 from the measurement signals from the measuring and reference coils. This difference is multiplied in a multiplier 5 by the signal U ⁇ , and in a multiplier 6 by the signal U 2 _.
  • U c1 and U c2 result , U c1 being proportional to the real part (R c ) and U c2 to the imaginary part (X c ) of the complex coupling impedance Z c of the coil system.
  • the two voltages are digitized with the aid of an AD converter 9.
  • the distance d sought is calculated, for example, on the basis of equation (1).
  • the speed v can be calculated according to equations (2) and (3).
  • the characteristic curve for the distance d can be linearized.
  • Fig. 2a is a sensor 3 for simultaneous measurement of the distance d to a measurement object 12 in the form of a gear 13, e.g. to determine the unbalance, and to measure the speed of the gear 13.
  • the sensor 3 consists of a flat, ferromagnetic coil carrier 14, which is adapted to the curvature of the gear wheel 13, on the surfaces of which the coil system 15 is applied.
  • the coil system 15 is shown in more detail in FIG. 2b and comprises a measuring coil 16, which is constructed in such a way that in the case of the winding parts 17, which are oriented perpendicular to the direction of movement of the gear wheel (y direction), a plurality of wires are twisted together.
  • the length of the measuring coil 16 in the x direction corresponds approximately to a slot-tooth period of the gear wheel 13.
  • a compensation coil 18 is wound as a ring coil over the coil carrier 14, which results in the coil parameters being independent of the measurement object 12.
  • the one in Fig. 2a Electronics 19 further shown is connected to the measuring coil 16 via a cable 20.
  • FIG. 3a represents a sensor 3 designed for installation in a magnetic levitation vehicle.
  • both the distance d of the vehicle from the profiled roadway and the speed of the vehicle are to be determined.
  • the same components have the same reference numerals as in Fig.
  • the senor 3 comprises a flat, ferromagnetic coil carrier 14, on the surface of which a measuring coil 16 is applied in such a way that the winding parts 21, which are aligned in the x direction, are on the surface 22 facing side of the carrier 14.
  • the winding parts 17 arranged in the y direction are located on the side of the carrier 14 facing away from the profiled surface 22.
  • the reference coil 18 is arranged as a ring coil around the carrier 14.
  • FIG. 4 shows an arrangement according to FIGS. 2 or 3, the coils here being designed in a planar technique.
  • FIG. 5 shows a further embodiment of the sensor 3.
  • the magnetic field of the winding parts 17 of the measuring coil 16 extending in the y direction is canceled by an opposing field. This is achieved by two winding parts 23 which are wound in the y-z plane.
  • the field of the winding parts 17 is eliminated, so that only the field of the winding parts 21 is important for the measurement.
  • the remaining field of the winding parts 23 is no longer relevant for the measurement.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

L'invention concerne un procédé et un dispositif pour déterminer des paramètres de mouvement d'une surface (22) conductrice, de préférence profilée, par rapport à un détecteur (3). Ce dernier (3) présente au moins une bobine servant à créer un champ électromagnétique alternatif qui, en raison de la réaction provoquée par des changements de position entre la surface (22) et le détecteur (3), est soumis à une variation qui est détectée au moyen de la bobine (16). Selon l'invention, le changement de position est déduit à partir de l'impédance de couplage (Zc) de la bobine (16), et la composante réelle (Rc) et la composante imaginaire (Xc) de l'impédance de couplage complexe (Zc) de la bobine (16) sont déterminées. La distance (d) entre le détecteur (3) et la surface (22) est calculée en fonction des valeurs déterminées sur la base d'un algorithme.
EP04711559A 2003-04-30 2004-02-17 Procede et dispositif pour determiner des parametres de mouvement d'une surface conductrice, de preference profilee Withdrawn EP1618352A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10319818 2003-04-30
DE10332761A DE10332761A1 (de) 2003-04-30 2003-07-17 Verfahren und Vorrichtung zur Bestimmung von Bewegungsparametern einer leitenden, vorzugsweise profilierten Oberfläche
PCT/DE2004/000296 WO2004097333A2 (fr) 2003-04-30 2004-02-17 Procede et dispositif pour determiner des parametres de mouvement d'une surface conductrice, de preference profilee

Publications (1)

Publication Number Publication Date
EP1618352A2 true EP1618352A2 (fr) 2006-01-25

Family

ID=33420005

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04711559A Withdrawn EP1618352A2 (fr) 2003-04-30 2004-02-17 Procede et dispositif pour determiner des parametres de mouvement d'une surface conductrice, de preference profilee

Country Status (3)

Country Link
US (1) US7275015B2 (fr)
EP (1) EP1618352A2 (fr)
WO (1) WO2004097333A2 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7912661B2 (en) * 2006-03-31 2011-03-22 Kmg2 Sensors Corporation Impedance analysis technique for frequency domain characterization of magnetoelastic sensor element by measuring steady-state vibration of element while undergoing constant sine-wave excitation
EP2904354A2 (fr) * 2012-10-02 2015-08-12 Mark Anthony Howard Détecteur de déplacement inductif
EP2937976B1 (fr) * 2014-04-22 2017-11-22 Skf Magnetic Mechatronics Dispositif de commande de palier magnétique électronique avec dispositif de compensation de puissance réactive automatique
DE102016208377A1 (de) * 2016-05-17 2017-11-23 Voith Patent Gmbh Überwachung eines horizontalen Dämpfungselements für ein Schienenfahrzeug
FR3094497B1 (fr) * 2019-03-25 2021-02-26 Safran Aircraft Engines Mesure de l'entrefer d'un capteur de rotation au moyen du capteur lui même
CN111141796A (zh) * 2020-02-24 2020-05-12 张洮 微波电容传感器及被测物介电特性和绝对位置的测量方法
US11333528B1 (en) * 2020-11-03 2022-05-17 Infineon Technologies Ag Method for on-chip wheel pitch recognition for magnetoresistive sensors

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DE3201811A1 (de) * 1982-01-21 1983-09-08 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zur erfassung von drehzahl, winkel, lage
DE3240478A1 (de) * 1982-11-02 1984-05-03 Messerschmitt-Bölkow-Blohm GmbH, 8000 München Sensor zum erfassen von magnetfeldverzerrungen bzw. aus diesen ableitbaren messgroessen
DE3244420A1 (de) 1982-12-01 1984-06-07 Messerschmitt-Bölkow-Blohm GmbH, 8000 München Abstandssensor fuer ein magnetschwebefahrzeug
DE3409448A1 (de) 1983-03-16 1984-09-20 Thyssen Industrie Ag, 4300 Essen Verfahren und vorrichtung zur bestimmung des abstandes einer magnetischen sonde von einer leitfaehigen reaktionsschiene
DE19631438C2 (de) * 1996-08-03 1999-10-07 Micro Epsilon Messtechnik Wirbelstromsensor
DE19646056C2 (de) * 1996-11-07 1998-11-26 Vogt Electronic Ag Vorrichtung zum Messen der Drehzahl eines um eine Drehachse rotierenden Körpers
DE19927759A1 (de) 1999-06-17 2001-01-04 Siemens Krauss Maffei Lokomoti Vorrichtung zur magnetischen Abstandsmessung
US6815944B2 (en) * 2002-01-31 2004-11-09 Allegro Microsystems, Inc. Method and apparatus for providing information from a speed and direction sensor

Non-Patent Citations (1)

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Title
See references of WO2004097333A2 *

Also Published As

Publication number Publication date
US7275015B2 (en) 2007-09-25
WO2004097333A3 (fr) 2005-04-28
WO2004097333A2 (fr) 2004-11-11
US20060071658A1 (en) 2006-04-06

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